2014 Fiscal Year Final Research Report
Magnetic properties of bosonization mechanisms in low-dimensional half-spin system with bond-randomness
| Project/Area Number |
23684029
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics II
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| Research Institution | Kagoshima University |
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Principal Investigator |
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| Project Period (FY) |
2011-04-01 – 2015-03-31
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| Keywords | 試料作製 / 中性子散乱 / 強磁場磁化 / 電スピン共鳴 / 複屈折 / スピンチューブ |
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| Outline of Final Research Achievements |
We study the ground state of IPA-Cu(ClxBr1-x)3 for 0<x<1. For x=0.95, we found that bond randomness contributes to a temperature independent broadening and blue-shift of the magnon resonance at temperatures T>12.5 K. For x=0.83, we observed some ESR branches for typical antiferromagnetic modes with biaxial anisotropy. We have analyzed the magnetization curve and the ESR excitation modes for H//b by using a two sub-lattice model and obtained good agreement between experiment and calculation. For x=0.3, 0.25, we investigated by muSR. The Fourier spectrum of electron spin fluctuation obtained by LF-muSR technique shows that there exists soft-mode toward a possible phase transition to an exotic phase such as Bose-glass.
Furthermore, we study magnetic properties of triangular spin tubes composed of CsCr1-xAxF4 and KCr1-xAxF4 (A= Al, Ga, Fe), which consisted of one-dimensional Heisenberg antiferromagnets coexisting with geometrically-frustrated spin systems with bond randomness.
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| Free Research Field |
低次元磁性体
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